Ajaxian reports that Safari gets a Javascript debugger.
"Webkit - the development version of Safari, has gotten a real javascript debugger. Its called Drosera, and the Surfin Safari blog has the announcement. Or you can just download the latest nightly of Webkit and go."
I downloaded it and gave it a try. But I must confess I got stuck very early. I didn't even find out how to debug an external script file. Did anybody have any success with Drosera?